High-Precision Limb-Darkening Measurement of a K3 Giant Using Microlensing

D L Fields; M D Albrow; J-P Beaulieu; J A R Caldwell; D L DePoy; Martin Dominik; B S Gaudi; A Gould; J Greenhill; K Hill; U G Jorgensen; S Kane; R Martin; J Menzies; R W Pogge; K R Pollard; P D Sackett; K C Sahu; P Vermaak; R Watson; A Williams; J F Glicenstein; P H Hauschildt; PLANET Collaboration

doi:10.1086/378196

High-Precision Limb-Darkening Measurement of a K3 Giant Using Microlensing

D L Fields, M D Albrow, J-P Beaulieu, J A R Caldwell, D L DePoy, Martin Dominik, B S Gaudi, A Gould, J Greenhill, K Hill, U G Jorgensen, S Kane, R Martin, J Menzies, R W Pogge, K R Pollard, P D Sackett, K C Sahu, P Vermaak, R WatsonA Williams, J F Glicenstein, P H Hauschildt, PLANET Collaboration

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We obtain high-precision limb-darkening measurements in five bands (V, V-E, I-E, I, and H) for the K3 III (T-eff = 4200 K, [Fe/H] = +0.3, log g = 2.3) source of the Galactic bulge microlensing event EROS BLG-2000-5. These measurements are inconsistent with the predictions of atmospheric models at higher than 10 sigma. While the disagreement is present in all bands, it is most apparent in I, I-E, and V-E, in part because the data are better and in part because the intrinsic disagreement is stronger. We find that when limb-darkening profiles are normalized to have unit total flux, the I-band models for a broad range of temperatures all cross each other at a common point. The solar profile also passes through this point. However, the profile as measured by microlensing does not. We hypothesize that the models have incorporated some aspect of solar physics that is not shared by giant atmospheres.

Original language	English
Pages (from-to)	1305-1319
Number of pages	15
Journal	Astrophysical Journal
Volume	596
Issue number	2
DOIs	https://doi.org/10.1086/378196
Publication status	Published - 20 Oct 2003

Keywords

gravitational lensing
stars : atmospheres
STELLAR ATMOSPHERE
PLANET PHOTOMETRY
MACHO 98-SMC-1

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10.1086/378196

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Fields, D. L., Albrow, M. D., Beaulieu, J.-P., Caldwell, J. A. R., DePoy, D. L., Dominik, M., Gaudi, B. S., Gould, A., Greenhill, J., Hill, K., Jorgensen, U. G., Kane, S., Martin, R., Menzies, J., Pogge, R. W., Pollard, K. R., Sackett, P. D., Sahu, K. C., Vermaak, P., ... PLANET Collaboration (2003). High-Precision Limb-Darkening Measurement of a K3 Giant Using Microlensing. Astrophysical Journal, 596(2), 1305-1319. https://doi.org/10.1086/378196

@article{8957a60a355b405dbe4e18643632d07f,

title = "High-Precision Limb-Darkening Measurement of a K3 Giant Using Microlensing",

abstract = "We obtain high-precision limb-darkening measurements in five bands (V, V-E, I-E, I, and H) for the K3 III (T-eff = 4200 K, [Fe/H] = +0.3, log g = 2.3) source of the Galactic bulge microlensing event EROS BLG-2000-5. These measurements are inconsistent with the predictions of atmospheric models at higher than 10 sigma. While the disagreement is present in all bands, it is most apparent in I, I-E, and V-E, in part because the data are better and in part because the intrinsic disagreement is stronger. We find that when limb-darkening profiles are normalized to have unit total flux, the I-band models for a broad range of temperatures all cross each other at a common point. The solar profile also passes through this point. However, the profile as measured by microlensing does not. We hypothesize that the models have incorporated some aspect of solar physics that is not shared by giant atmospheres.",

keywords = "gravitational lensing, stars : atmospheres, STELLAR ATMOSPHERE, PLANET PHOTOMETRY, MACHO 98-SMC-1",

author = "Fields, {D L} and Albrow, {M D} and J-P Beaulieu and Caldwell, {J A R} and DePoy, {D L} and Martin Dominik and Gaudi, {B S} and A Gould and J Greenhill and K Hill and Jorgensen, {U G} and S Kane and R Martin and J Menzies and Pogge, {R W} and Pollard, {K R} and Sackett, {P D} and Sahu, {K C} and P Vermaak and R Watson and A Williams and Glicenstein, {J F} and Hauschildt, {P H} and {PLANET Collaboration}",

year = "2003",

month = oct,

day = "20",

doi = "10.1086/378196",

language = "English",

volume = "596",

pages = "1305--1319",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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Fields, DL, Albrow, MD, Beaulieu, J-P, Caldwell, JAR, DePoy, DL, Dominik, M, Gaudi, BS, Gould, A, Greenhill, J, Hill, K, Jorgensen, UG, Kane, S, Martin, R, Menzies, J, Pogge, RW, Pollard, KR, Sackett, PD, Sahu, KC, Vermaak, P, Watson, R, Williams, A, Glicenstein, JF, Hauschildt, PH & PLANET Collaboration 2003, 'High-Precision Limb-Darkening Measurement of a K3 Giant Using Microlensing', Astrophysical Journal, vol. 596, no. 2, pp. 1305-1319. https://doi.org/10.1086/378196

TY - JOUR

T1 - High-Precision Limb-Darkening Measurement of a K3 Giant Using Microlensing

AU - Fields, D L

AU - Albrow, M D

AU - Beaulieu, J-P

AU - Caldwell, J A R

AU - DePoy, D L

AU - Dominik, Martin

AU - Gaudi, B S

AU - Gould, A

AU - Greenhill, J

AU - Hill, K

AU - Jorgensen, U G

AU - Kane, S

AU - Martin, R

AU - Menzies, J

AU - Pogge, R W

AU - Pollard, K R

AU - Sackett, P D

AU - Sahu, K C

AU - Vermaak, P

AU - Watson, R

AU - Williams, A

AU - Glicenstein, J F

AU - Hauschildt, P H

AU - PLANET Collaboration

PY - 2003/10/20

Y1 - 2003/10/20

N2 - We obtain high-precision limb-darkening measurements in five bands (V, V-E, I-E, I, and H) for the K3 III (T-eff = 4200 K, [Fe/H] = +0.3, log g = 2.3) source of the Galactic bulge microlensing event EROS BLG-2000-5. These measurements are inconsistent with the predictions of atmospheric models at higher than 10 sigma. While the disagreement is present in all bands, it is most apparent in I, I-E, and V-E, in part because the data are better and in part because the intrinsic disagreement is stronger. We find that when limb-darkening profiles are normalized to have unit total flux, the I-band models for a broad range of temperatures all cross each other at a common point. The solar profile also passes through this point. However, the profile as measured by microlensing does not. We hypothesize that the models have incorporated some aspect of solar physics that is not shared by giant atmospheres.

AB - We obtain high-precision limb-darkening measurements in five bands (V, V-E, I-E, I, and H) for the K3 III (T-eff = 4200 K, [Fe/H] = +0.3, log g = 2.3) source of the Galactic bulge microlensing event EROS BLG-2000-5. These measurements are inconsistent with the predictions of atmospheric models at higher than 10 sigma. While the disagreement is present in all bands, it is most apparent in I, I-E, and V-E, in part because the data are better and in part because the intrinsic disagreement is stronger. We find that when limb-darkening profiles are normalized to have unit total flux, the I-band models for a broad range of temperatures all cross each other at a common point. The solar profile also passes through this point. However, the profile as measured by microlensing does not. We hypothesize that the models have incorporated some aspect of solar physics that is not shared by giant atmospheres.

KW - gravitational lensing

KW - stars : atmospheres

KW - STELLAR ATMOSPHERE

KW - PLANET PHOTOMETRY

KW - MACHO 98-SMC-1

UR - http://www.scopus.com/inward/record.url?scp=0242382034&partnerID=8YFLogxK

UR - http://www.journals.uchicago.edu/cgi-bin/resolve?id=doi:10.1086/378196

U2 - 10.1086/378196

DO - 10.1086/378196

M3 - Article

SN - 0004-637X

VL - 596

SP - 1305

EP - 1319

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

High-Precision Limb-Darkening Measurement of a K3 Giant Using Microlensing

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Keywords

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